Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Additional Disclosure (Details)

v3.4.0.3
Stockholders' Equity - Additional Disclosure (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Shares      
Outstanding at the beginning of the period (in shares) 700,000 700,000  
Outstanding at the end of the period (in shares) 500,000 700,000 700,000
Additional disclosure      
Share based compensation expenses $ 2,570 $ 2,236 $ 2,147
Unrecognized compensation cost $ 0    
Stock options      
Shares      
Outstanding at the beginning of the period (in shares) 658,170    
Granted (in shares) 29,225    
Forfeited, cancelled or expired (in shares) (219,764)    
Outstanding at the end of the period (in shares) 467,631 658,170  
Vested and expected to vest (in shares) 467,631    
Options exercisable 459,770    
Weighted Average Exercise Price      
Outstanding at the beginning of the period (in dollars per share) $ 25.57    
Granted (in dollars per share) 12.80    
Forfeited, cancelled or expired (in dollars per share) 38.76    
Outstanding at the end of the period (in dollars per share) 22.68 $ 25.57  
Vested and expected to vest (in dollars per share) 22.68    
Exercisable (in dollars per share) $ 22.67    
Weighted Average Remaining Contractual Term (in years)      
Outstanding at the end of the period 2 years 8 months 12 days    
Vested and expected to vest 2 years 8 months 12 days    
Exercisable 2 years 9 months 18 days    
Weighted-average assumptions used to calculate estimated fair value of each stock option      
Risk-free interest rates (as a percent) 1.50% 1.80% 0.90%
Expected lives (in years) 5 years 8 months 12 days 5 years 8 months 12 days 5 years 8 months 12 days
Expected volatility (as a percent) 59.00% 77.00% 77.30%
Weighted average grant date fair value of options granted during the period (in dollars per share) $ 6.84 $ 18.80 $ 12.00
Additional disclosure      
Share based compensation expenses $ 1,248 $ 1,071 $ 1,117
Cash received for exercise price   302 464
Intrinsic value   $ 129 $ 225
Weighted average grant date fair value of options exercised during the period (in dollars per share)   $ 26.75 $ 39.96
Voluntarily terminated unvested stock options 65,508    
Compensation costs related to voluntarily terminated unvested stock options $ 700